html ,
body ,
div ,
header,
nav,
main,
aside,
article,
footer,
section,
span,
ul , 
ol,
li,
p,
h1,h2,h3,h4,h5,h6,
form,
table {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
a,
a:hover,
a:focus {
    color: #000;
    text-decoration: none;
}

ul , ol {
    list-style: none;
}

input, button , textarea {
    border: 0px;
    box-sizing: border-box;
    outline: none;
}

.clearfix::after {
    content: "";
    display: block;
    clear: both;
}